Small baby water vole just caught at the bottom of the frame. They are the size of bank voles and field voles, but much darker in colour.
Possibly mother or father vole.
Baby peers out cautiously.
Below, adult voles.
Water voles are well-rounded and plump - they eat 70% of their body weight every day, from a range of at least 227 different species of plants. This one is eating catkins covered in protein-rich pollen.